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BPA exposure disrupts human egg maturation

Date:
July 31, 2013
Source:
Brigham and Women's Hospital
Summary:
Exposure to BPA (Bisphenol-A) could be a contributing factor as to why some infertile couples are having difficulty conceiving.
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As many as 20 percent of infertile couples in the United States have unexplained reasons for their infertility. Now, new research led by Catherine Racowsky, PhD, director of the Assisted Reproductive Technologies Laboratory at Brigham and Women's Hospital (BWH), shows that exposure to BPA (Bisphenol-A) could be a contributing factor as to why some infertile couples are having difficulty conceiving.

The study will be published online on July 31, 2013 in the journal Human Reproduction.

"To our knowledge, this is the first study that has shown that BPA has a direct effect on egg maturation in humans," said Dr. Racowsky. "Because exposure to BPA is so ubiquitous, patients and medical professionals should be aware that BPA may cause a significant disruption to the fundamentals of the human reproductive process and may play a role in unexplained infertility."

The randomized trial examined 352 eggs from 121 consenting patients at a fertility clinic. The eggs, which would have otherwise been discarded, were exposed to varying levels (20 ng/ml, 200 ng/ml and 20 µg/ml) of BPA in a laboratory setting. An egg from each patient was not exposed to BPA and served as the control. Researchers then examined the eggs and found that exposure to BPA caused:

  • A decrease in the percentage of eggs that matured.
  • An increase in the percentage of eggs that degenerated.
  • An increase in the percentage of eggs that underwent spontaneous activation, the abnormal process when an egg acts as though it has been fertilized, even though it has not been.

As the BPA dose increased, there was a decreased likelihood of maturity, an increased likelihood of degeneration and an increased likelihood of spontaneous activation. Additionally, among the mature eggs, there was a significant trend toward a decreased incidence of bipolar spindles and aligned chromosomes with an increased dose of BPA. Researchers note that these results are similar to the previous research examining the impact of BPA exposure on animal eggs.

Racowsky said, "Our data show that BPA exposure can dramatically inhibit egg maturation and adds to a growing body of evidence about the impact of BPA on human health. I would encourage further research to gain a greater understanding of the role BPA plays in infertility."


Story Source:

Materials provided by Brigham and Women's Hospital. Note: Content may be edited for style and length.


Journal Reference:

  1. Ronit Machtinger, Catherine M.h. Combelles, Stacey A. Missmer, Katharine F. Correia, Paige Williams, Russ Hauser, and Catherine Racowsky. Bisphenol-A and human oocyte maturation in vitro. Human Reproduction, 2013 DOI: 10.1093/humrep/det312

Cite This Page:

Brigham and Women's Hospital. "BPA exposure disrupts human egg maturation." ScienceDaily. ScienceDaily, 31 July 2013. <www.sciencedaily.com/releases/2013/07/130731093718.htm>.
Brigham and Women's Hospital. (2013, July 31). BPA exposure disrupts human egg maturation. ScienceDaily. Retrieved March 28, 2024 from www.sciencedaily.com/releases/2013/07/130731093718.htm
Brigham and Women's Hospital. "BPA exposure disrupts human egg maturation." ScienceDaily. www.sciencedaily.com/releases/2013/07/130731093718.htm (accessed March 28, 2024).

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